Improvement in let-off motion foe looms



e il. @uitrit tetes latrut @Hina RIGHARDYWALKER, OF MILFORD,MASSACHUSETTS.

` Letters' Parmi No. 70,297, ma october 29,1867.

IMPROVEMENT IN LET-OFP MOTION FORALOOMS.

TO A LL WHOM IT MAY CONCERN:

Bue it known that I, RICHARD WALKER, of Milford, in the county ofWorcester, and State of Massachusetts, have invented a new and usefulImprovement in a Self-Adjusting Yarn-Beam Brake, of which the following-is a full, clear, andexact description, reference being had to theaccompanying drawings, making a part of this specification, in which vlFigure 1 represents a vertical transverse section of a dresser-frame,beam, Svc. Figure 2 represents an end elevation of the saine. i Figure 3represents a detail of the pad and its attachment. Figure 4 represents amodification of my invention, showing a different arrangement of theparts. The object of my invention is to provide a self-adjustingfriction-brake thatv may be applied to any yarn l or dresser-beam, 35e.,where a regular and uniform amount of tension is desired from a full toan empty beam,

and to measure and adjust the amount of power applied, thus securingr anequal tension to all the beams, and increasing or diminishing thefriction to any amount.

My invention consists in placing a friction-wheel on the end of thebeam, or connecting it by gears or other mechanical device with one ofthe heads of the beam.' The brake, which acts against thisfriction-wheel, may be lined with rubber, and is hinged to the short armof the brake-lever. The longer and curved arm of said brake-leverextends downwards to a distance corresponding to the di''erence of theradius of the beam-head and that of the yarn-beam. It also consists in abar bearing against the inner curve of the brake-lever, incombinationwith a. spiralspring and adjusting-screw, and, being supplied with ascale and index, is acted upon by a lever or levers, which operateagainst the yarn on the yarn-beam, thus producing the required friction.In

` order to reduce the friction gradually as the yarn leaves the beam,the said bar must move up toward the fulcrum of the brake-lever the samedistance and in the same ratio as the yarn is unwound from the beam.This is eiected by setting the lower end of the brake-lever a littleforward and nearer to the pivot of the bar than its fulerum, when thebar will run up by means of lthe pressure of the sp'iral `spring. Thisupward motion of the bar is couuterbalanced by a double lever, one armof which rests upon saidbar, while the other arm, reach ing inside ofthe beam-head, is resting with the pad at its end on the yarn at theunder side of 4the beam, sol that when the beam is full the said padwill bear on the surface of the yarn and keep the bar down, thusexerting the greatest amount of friction, and, as the yarn winds olf,the pad and bar vwill rise together, and thus reduce the friction. Anindex-point, attached to the nut of the adjusting-screw, will indicateon a graduated scale, engraved upon the bar, the degree of pressureonthe brake-lever.

To enable others skilled in the art to make and use mydnvention, I willproceed to describe the same with reference to the drawings. i

In figs. 1 and 2, A represents the dresser-frame; B the yarn-beam, witha head, C, and the friction-wheel, D, attachedto it. The brake E,provided with the rubber F pressing against the friction-wheel D, ispivoted to a short arm, a, of the brake-lever G, the longer arm, I), ofwhich is curved, and of a length equal to the distance of the axis ofthe yarn-beam from the periphery of the yarn-beam head C. The fulcrum cof the brake-lever G is attached to the arm d of the bracket or plate H,while to the otherarm,` e, is pivoted a bar, K. The bar K carries, atthe end nearest the brale-lever G, a short slide,f, containirig thesmall frictionroller g, which rolls up and down on the inner edge of thecurved lever G, said edge corresponding to the sweep of the bar K, andbetween said slidef and the pivoted end of bar K is arranged a spiralspring, 7L, which operates the brake-lever' G, and is placed around anadjusting-screw, z'. The spring L is confined between'the slide fand theuut lc, and thus operates against the brake-lever G, and produces therequired friction. The tension of the spring 71, is adjusted by the nut7c. The pointer m is attached to the nut c, and indicates on a graduatedscale of the bar K the degree of pressure in pounds on the brake-leverG. The two levers L and M are secured to a common sleeve, and oscillateon a stud,p. The lever M rests on the bar K, and the lever L, beingprovided at the end with a pad, P, presses against the yarn on theyarn-beam :Bz

For convenience, or to increase the poweron the beam, the friction-wheelmay be made detachable from the yarn-beam, and revolve on a stud onbracket H. A pinion may be rmly secured to the friction-wheel, whichworks in teeth on the beam-head, as 'shown in fig. 4. When it isrequired to remove the yarn-beam the bar K is dropped off the .lower endof brake-lever G, which admits of the journals of the yarn-beam B beingslipped out from their bearings.

Having thus described my invention, what I claim as new, and desire tosecure by Letters. Patent, is-

1. The combination, with a. yarn or dresser-beam, of-u. brake, E,:attached to a. curved lever, G, the bur K, provided with a. slide,f,and spring, L, and the arms or levers L M, substantially as und for thevpurpose set forth.

2. I claim the combination of the vibrating bar K, provided with spring,h, a. graduated scaleand indicater, m, with the arms 0r levers L M,whereby the pressure of the pad P on the yurn of the yarn-beam may beregulated and adjusted. i i

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

RICHARD WALKER.

Witnesses:

DAVID KELLEHER.

